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myca99
455
how to check for existing owner before adding one?
posted

Hello,

How do you check that an owner exists in the OwnerCollection before you try to add a new one? 

                    if (this._calendarInfo.Owners[ownerID] == null)
                    {
                        taskedOwner = this._calendarInfo.Owners.Add(ownerID);
                        baseTask.Resources.Clear();
                        baseTask.Resources.Add(taskedOwner);

                    }

but it threw an exception on the first line about the key not being found. 

I also tried the IndexOf() and GetItem() methods, but I got an index of 15 when the owner list was empty. 

Sorry if this is a simple question, I'm a C++ programmer learning C# and I didn't see example where it traversed the owner collection before adding a new one. 

Thanks,

Myca

  • 455
    Verified Answer
    posted

    Nevermind, I got it.  I just wasn't patient enough with what I had.  Here's what worked:

                        index = this._calendarInfo.Owners.IndexOf(ownerID);
                        if (index >= 0)
                        {
                            taskedOwner = (Owner)this._calendarInfo.Owners.GetItem(index);
                        }
                        else
                        {
                            taskedOwner = this._calendarInfo.Owners.Add(ownerID);
                        }
                        
                        if (baseTask != null)
                        {
                            baseTask.Resources.Clear();
                            baseTask.Resources.Add(taskedOwner);
                        }